This is the mail archive of the
cygwin@sources.redhat.com
mailing list for the Cygwin project.
Sorry, resent RE: Accessing exported variables in DLL with dlsym().
- To: <cygwin at sourceware dot cygnus dot com>
- Subject: Sorry, resent RE: Accessing exported variables in DLL with dlsym().
- From: "Andrej Borsenkow" <Andrej dot Borsenkow at mow dot siemens dot ru>
- Date: Thu, 6 Jul 2000 13:07:05 +0400
(Sorry, I clicked wong button)
>
> I am trying to port a program that opens dynamic library with
> dlopen() and looks up symbol with dlsym(). This works for
> function reference but not for variable. The porgram is:
>
> main.c:
>
> #include <dlfcn.h>
> #include <stdio.h>
>
> main() {
> int (*foo)(void);
> void *libfoo;
>
> libfoo = dlopen ("libfoo.dll", 0);
> foo = dlsym (libfoo, "foo");
> foo();
> }
>
> foo.c:
>
> #include <stdio.h>
> #include <dlfcn.h>
>
> __declspec (dllexport) extern foo (void);
>
> foo() {
> char *bar;
> void *libbar;
>
> libbar = dlopen ("libbar.dll", 0);
> bar = dlsym (libbar, "bar");
> puts (bar);
> }
... continued ...
bar.c:
__declspec (dllexport) char *bar = "Hi! I am bar.";
Compiled with:
gcc -c main.c foo.c bar.c
dllwrap --output-exp libfoo.exp --output-lib libfoo.a --output-def
libfoo.def --dllname libfool --export-all-symbols foo.o
dllwrap --output-exp libbar.exp --output-lib libbar.a --output-def
libbar.def --dllname libbar.dll --export-all-symbols bar.o
gcc -o main main.o
Unfortunately, this program prints nothing (that is, bar appears to be
found - but porbably points to wrong location). IF I bind foo.o with
libbar.a (and declare bar in foo.c as dllimport) I get correct result.
The foo() in main() is correctly found.
TIA
-andrej
--
Want to unsubscribe from this list?
Send a message to cygwin-unsubscribe@sourceware.cygnus.com